Shear bond strength of orthodontic brackets bonded with conventional and fluoride-releasing bonding materials with and without adhesive application

Mauricio Mezomo, Alexandre Gallina, Mariana Marquezan, Eduardo Martinelli de Lima


Objective: To evaluate the shear bond strength of a composite resin and a compomer for bonding brackets with and without adhesive application.
Methods: Eighty-eight extracted human premolars were divided into four groups: Control group resin (CGR), in which conventional resin Transbond™ XT Light Cure (3M Unitek™, USA) was used
to bond the brackets with prior application of the adhesive; Experimental group resin (EGR), in which conventional resin Transbond™ XT Light Cure was used without prior adhesive application; Control group compomer (CGC), in which compomer Transbond™ Plus Color Change (3M Unitek™, USA) was used with prior adhesive application; and Experimental group compomer (EGC), in which compomer Transbond™ Plus Color Change was used without prior adhesive application. A shear debond test was performed using an EMIC machine and results were analyzed by ANOVA and post hoc Tukey multiple comparison test.
Results: No statically significant difference was found between control and experimental groups for the conventional resin and compomer (P=0.802 and P=0.837). The compomer presented lower shear bond values than conventional resin (P=0.004 and P=0.003).
Conclusion: Considering the shear bond strength, the four groups evaluated presented adequate values, irrespective of using adhesive or not.


Dental adhesive; orthodontics; shear bond;

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